Apparatus for forming sine tracks



March 28, 1933. H. CAPDET APPARATUS FOR FQRMING SINE TRACKS original Filed Nov. 29, 1929' lll ghe/LWP.'

Patented Mar. 28, 1933 UNITED STATES PATE'NToF-FICE y v.HIEHI'RI CAPDET, OF TOULOUSE, FRANCE APPARATUS FOR FORLlVIING SINE TRACKS i original application filed November 29, 1929,7seria1 Nq. 410,591, and in; France Novenbef .12, 11929.'r

` Divided and this application led November 25, 1930. Serial No. 498,195.` i

My present application, which is divided out from my pending application N o. 410,591 for Letters-Patent of the United States, relates to an apparatus for cutting 5 out tracks of a sine shape on aguide cylinder intended to guide rollers connectedto a reciprocating piston, so that when the rollers follow the sinetrack the reciprocation of the piston is transformed into rotation of a 19 shaft.` A: transformation of that kind vis more fully described in my" pending application No. 333,112 for Letters-Patent of the United States.

For cutting outthetrack on the guide cylinder of the piston use is made of a cam or cams of acircular contour, eccentric on their axes and engaging a Hat surface perpendicular to the axis of thecylinder in which the track is to be cut out. The upper bear- 29 ingsurface of the track is'cut out on one half of the guide cylinder and the lower bearing surface Aon another half, the two halves of the guide cylinder being assembled thereafter to form the full track,the embossed portions of the curve on the upperfhalf-cylinder being placed opposite the depressed portions of the curve on the lower half-cylin der, and viceversa. A Y

The object of the present invention is to obtain an apparatus adapted to-impart to each half of the guidecylinder above referred to such a motion in respect of a milling tool that a track of sine shape will be cut out therein.

In the accompanying drawing which illustrates diagrammatically by way of ex.-

ample an embodiment ofthe invention: y

Figure 1 is a vertical axial section of the apparatus supporting a half-cylinder.

Figure 2 is ahorizontal axial section of the apparatus turned by a quarter of a revolution in respect of the position of Figure 1. l The `half-cylinder a, in which the upper L, or lower surface b, indifferently, of'thetrack o is to be cut out, is provided with two plates `c connected integrally with the base#1 of the halfecylinder by any means such as bolts (not shown). Between these plates rest the r camsl e eihaving a circular contour. Said cams are 'mounted eccentrically on` the axes tric cams e e in opposite directions., Said' v7c f' bearing the gearsfor the camscomprised, il:

forinstance, of pinions g g meshing with a central toothed crown h which receives rotation from any motor shaft designated by The toothed crown is adapted to rotate with-acentral shaft j on which a sleeve k will slide while Vthe rotation ofthe shaftjy is imparted to the sleeve c through aftonguegl passingin a corresponding groove in said sleeve. The sleeve c is attached, on the one 99 hand, to the half cylinder a and, on the other hand, directly to the plate c and indirectly to the plate d by the intermediary of the base of the half-cylinder a 'as shown diagrammatically in Figure 2.l ,65, l The central shaft j serves both to rotate the J half-cylinder a by means of the sleeve c and to guide said half-cylinder, whilel the track surface b is being cut out therein, by means of a shoulder m on the periphery ,of which 739 the cylinder will reciprocate. On the nose n of the shaft 7' will t loosely a bearing portion o (Figure 2) integral with` the 4toolholder whenthe latter is introduced into the 1 half-cylinder a in the position shown in the z5 drawing. The tool-holder is of any known type and is provided with any properl gearing adapted to impart rotation to the milling tools p p. It is supported by any ordinary carriage such as shown at g by its outlines. 39 If `it is necessary to grindthe surfaces on the half-cylinders after they have been cut out, grinding wheels willbe substituted for the milling tools. The rotation imparted to the motor shaft z' 8.15

Vis transmitted to the toothed crown L- and to the central shaft j, sleeve le and half-cylinder.V a. The axes of the cams are rotated by the pinions gigl which are rotated by the crown h. The ratio of the speed of the crown 71, to ,v that of the pinions g yg is equal to the number of reciprocations of the half-cylinder during its revolution. The axes f f move the eccencams resting alternatelyY on the flat bottomsf ,of the plates c al cause the sleeve 7c to reciprocate and consequently'also the half-cylinder a. TheV rotation of the latter, combined simultaneously with the reciprocation of the plates, is such' that any poi-nt on the axis of 100 p p only rotate about their axis which is stationary.

When the two surfaces-of the tracks have been thus cut out the two half-cylinders are 'assembled co-axially to form the'full track by the free space left-bn v` the cutv outportions and the circumferential lag between them must of course be such as to correspond with thel number of embossed and depressed portions of the curves on each half-cylinder. The

rollers that guide the piston for the conversion of movement as described in my above y tively will occupythe same'po'sition as the milling tools in relation to the track.

mentioned co-pending application 833,112

'In the above description with reference to the drawing, it will be understod that in Figure 1 the eccentrics e e havemoved the halfcylinder a towards the right hand so that the tools seen in end view atp are in contact with the bottom or left hand end of the track that Y is being cut, whereas in FigureI 2 the halfcylinder a having turned by a quarter of a revolution, the eccentrics e e have moved said 'half-cylinder to the leftv and the tools p p are in contact with the outer end portions of the track.' v Y f What I claim is: y i

1. An apparatus for cutting a sine track at the end of a guide cylinder, comprising a vtool having a stationary axis and adapted to cut theI end portion of said cylinder, in combination with a rotary shaft adapted to rotate the cylinder about its axis, means for causing the cylinder to reciprocate on -said shaft, a ltoothed crown integral with said shaft, two

Y pinions meshingwith said toothed crown, two 45 cams having a circular edge and mounted each eccentrically on the axis of one pinion,

"two plates integral Vwith said reciprocating cylinder, perpendicular to the axis thereof andy adapted to bear on the edge of said cams,

whereby a sinusoidal movement is given theY cylinder while the tool cuts the sine track therein. Y

2. A machine for cutting a sinusoidalcam surface at the end of a cylindrical piece of work, which comprises in combination, a bearing, an overhung shaft journalled in said bearing, means for causing saidpiece of work to rotate together with said shaft and allowing it to slide with respect to it, a toothed wheel keyed on said shaft between said bearing and said means, eccentric means, operaconnected with said toothed wheel, for reciprocating said piece of work with respect to said shaft synchronously with the rotary movement of said shaft, a tool havinga stationary axis disposed opposite the end of said piece of work, and means for driving said tool.

3. A machine for cutting a sinusoidal cam surface at the end of a c lindrical piece of work, which comprises `in combination, .a bearing, an overhung shaft journalled in said bearing, a sleeve slidingly keyed to said shaft and adapted to rigidly support said iece of work, a' toothed wheel keyed to said shaft between said bearing and said sleeve, eccentric means, operatively connected with saidftoothed wheel, for-reciprocating said piece of work with respect to said shaft in synchronism with the rotary movement vof said shaft, a tool having a stationary axis of revolution disposed opposite the edge of said cylindrical piece of work, and means for driving said tool. Y

4. A machine for cutting asinusoidal'cam surface at the end of a cylindricalpiece of work, which comprises in combination, a bearing, an overhung shaft j ournalled in said bearing, a sleeve slidingly keyed to said shaft and adapted to rigidly supportsaid piece of work, a toothed wheel keyed to vsaid shaft between said bearing and said sleeve, two cir-y cular rollers eccentrically pivoted about stationary axes means, operatively connected with said toothed wheel, for driving said rollers, a collar secured to said sleeve coaxially with, said shaft, another collar adapted to be fixed to said piece of work in parallel-relation with the first mentioned collar and at a distance therefrom equal to the diameter ofthe circlilar rollers, whereby said rollers are engaged between said collars and are able to cooperate therewith, a tool having a stationary axis of revolution disposed opposite the edge of said cylindrical piece of work, and means for driving said tool. i

5. vA machine for cutting a sinusoidal cam surface at the end of 'a cylindrical piece of work, which comprises in combination, a bearing, an 'overhung shaft journalled in said bearing, a sleeve slidingly keyed to said shaft at right angles to said shaft,

Aico

and adapted to rigidly support said piece of work, atoothed wheel keyed to said shaft bef tween said bearing and said sleeve, two pinions `having stationary axes of revolution at right angles to said shaft adapted to mesh with said toothed wheel, two circular vrollers eccentrically mounted on said pinions respecizo 1 tively, in parallel relation therewith, a collar site the edge of said cylindrical piece of Work,V y

an overhnng cylindrical casing forming a bearing for both said last mentioned shaft and said spindle, the free end of said cylindrical casing being adapted to coaXially engage the overhanging end of the first mentioned shaft, and a stop on said first mentioned shaft adapted to cooperate with the ends of said cylindrical casing.

In testimony whereof I hereunto aiiX my signature.

HENRI CAPDET. 

